Template Function thrust::merge(InputIterator1, InputIterator1, InputIterator2, InputIterator2, OutputIterator, StrictWeakCompare)

Function Documentation

template<typename InputIterator1, typename InputIterator2, typename OutputIterator, typename StrictWeakCompare>
OutputIterator thrust::merge(InputIterator1 first1, InputIterator1 last1, InputIterator2 first2, InputIterator2 last2, OutputIterator result, StrictWeakCompare comp)

merge combines two sorted ranges [first1, last1) and [first2, last2) into a single sorted range. That is, it copies from [first1, last1) and [first2, last2) into [result, result + (last1 - first1) + (last2 - first2)) such that the resulting range is in ascending order. merge is stable, meaning both that the relative order of elements within each input range is preserved, and that for equivalent elements in both input ranges the element from the first range precedes the element from the second. The return value is result + (last1 - first1) + (last2 - first2).

This version of merge compares elements using a function object comp.

The following code snippet demonstrates how to use

merge to compute the merger of two sets of integers sorted in descending order.
Return

The end of the output range.

Pre

The ranges [first1, last1) and [first2, last2) shall be sorted with respect to comp.

Pre

The resulting range shall not overlap with either input range.

Parameters

  • first1: The beginning of the first input range.

  • last1: The end of the first input range.

  • first2: The beginning of the second input range.

  • last2: The end of the second input range.

  • result: The beginning of the merged output.

  • comp: Comparison operator.

Template Parameters

  • InputIterator1: is a model of Input Iterator, InputIterator1's value_type is convertable to StrictWeakCompare's first_argument_type. and InputIterator1's value_type is convertable to a type in OutputIterator's set of value_types.

  • InputIterator2: is a model of Input Iterator, InputIterator2's value_type is convertable to StrictWeakCompare's second_argument_type. and InputIterator2's value_type is convertable to a type in OutputIterator's set of value_types.

  • OutputIterator: is a model of Output Iterator.

  • StrictWeakCompare: is a model of Strict Weak Ordering.

#include <thrust/merge.h>
#include <thrust/functional.h>
...
int A1[6] = {11, 9, 7, 5, 3, 1};
int A2[7] = {13, 8, 5, 3, 2, 1, 1};

int result[13];

int *result_end = thrust::merge(A1, A1 + 6, A2, A2 + 7, result, thrust::greater<int>());
// result = {13, 11, 9, 8, 7, 5, 5, 3, 3, 2, 1, 1, 1}

See

http://www.sgi.com/tech/stl/merge.html

See

sort

See

is_sorted